Craig Topper 98435b8bdf [X86][InstCombine] Add support for scalar FMA intrinsics to SimplifyDemandedVectorElts.
This teaches SimplifyDemandedElts that the FMA can be removed if the lower element isn't used. It also teaches it that if upper elements of the first operand aren't used then we can simplify them.

git-svn-id: https://llvm.org/svn/llvm-project/llvm/trunk@289377 91177308-0d34-0410-b5e6-96231b3b80d8
2016-12-11 08:54:52 +00:00
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